##// END OF EJS Templates
Arg, forgot the most important:...
Arg, forgot the most important: Put the pandoc version test under the pandoc_available test. This avoids raising an exception when the module is imported: the exception is only raised on pandoc(...) function calls. It also prints warnings if pandoc is not found at import time and if the version does not meet the expected one.

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nbjson.py
72 lines | 2.0 KiB | text/x-python | PythonLexer
"""Read and write notebooks in JSON format.
Authors:
* Brian Granger
"""
#-----------------------------------------------------------------------------
# Copyright (C) 2008-2011 The IPython Development Team
#
# Distributed under the terms of the BSD License. The full license is in
# the file COPYING, distributed as part of this software.
#-----------------------------------------------------------------------------
#-----------------------------------------------------------------------------
# Imports
#-----------------------------------------------------------------------------
import copy
import json
from .nbbase import from_dict
from .rwbase import (
NotebookReader, NotebookWriter, restore_bytes, rejoin_lines, split_lines
)
from IPython.utils import py3compat
#-----------------------------------------------------------------------------
# Code
#-----------------------------------------------------------------------------
class BytesEncoder(json.JSONEncoder):
"""A JSON encoder that accepts b64 (and other *ascii*) bytestrings."""
def default(self, obj):
if isinstance(obj, bytes):
return obj.decode('ascii')
return json.JSONEncoder.default(self, obj)
class JSONReader(NotebookReader):
def reads(self, s, **kwargs):
nb = json.loads(s, **kwargs)
nb = self.to_notebook(nb, **kwargs)
return nb
def to_notebook(self, d, **kwargs):
return rejoin_lines(from_dict(d))
class JSONWriter(NotebookWriter):
def writes(self, nb, **kwargs):
kwargs['cls'] = BytesEncoder
kwargs['indent'] = 1
kwargs['sort_keys'] = True
kwargs['separators'] = (',',': ')
if kwargs.pop('split_lines', True):
nb = split_lines(copy.deepcopy(nb))
return py3compat.str_to_unicode(json.dumps(nb, **kwargs), 'utf-8')
_reader = JSONReader()
_writer = JSONWriter()
reads = _reader.reads
read = _reader.read
to_notebook = _reader.to_notebook
write = _writer.write
writes = _writer.writes